Water: The source of life and the lubricant of the body

Water is a nutrient transporter and a lubricant for the body.

Water is the source of life. For humans, water is the second most important substance after oxygen for sustaining life. Water is a crucial component of human cells, and the body's metabolism and physiological activities all depend on it. In a normal adult body, 60% to 70% of the mass is water; the proportion is even higher in children, reaching nearly 80%, and in the elderly, the body is 55% water. Approximately 150 ml of water is needed per kilogram of body weight per day, and breast milk is predominantly water. A person can survive for a month without food, relying solely on stored nutrients or consuming their own tissues. However, without water, they would struggle to survive even a week. A 10% loss of body water threatens health, and a 20% loss is life-threatening, demonstrating the vital importance of water to life.

The water in our bodies comes from various foods and drinks. By ingesting water, we participate in the body's chemical reactions, transporting other nutrients to the parts of the body that need them, in order to maintain our life functions and ensure the stability of biological signs such as respiration and body temperature.

Water's importance to our bodies is reflected in the following aspects: First, its role in dissolving and digestion. Water is an essential medium for all biochemical changes in physiological processes within the body. Water has a strong dissolving and ionizing capacity (water molecules are highly polar), allowing water-soluble substances to exist in a dissolved state and as electrolyte ions. Even some fats and proteins can dissolve in water under appropriate conditions, forming emulsions or colloidal solutions. Substances dissolved or dispersed in water facilitate the effective conduct of chemical reactions within the body. After food enters the cavity and gastrointestinal tract, digestion and absorption rely on digestive juices secreted by the digestive organs, such as saliva, gastric juice, pancreatic juice, intestinal juice, and bile. Water accounts for over 90% of these digestive juices. Second, its role in metabolic functions. During metabolism, the exchange of substances and chemical reactions within the body take place in water. Water is not only a medium for biochemical reactions within the body, but it also participates in oxidation, reduction, synthesis, and decomposition reactions. Water is essential for the normal metabolism of various chemical substances within the body. If the human body is chronically dehydrated, its metabolic function will become abnormal, slowing down metabolism and leading to the accumulation of excess energy and fat, resulting in obesity. Therefore, to lose weight, drink more water. Thirdly, water serves as a carrier for transport. Due to its high solubility and fluidity, and its inclusion in various tissues and organs, water acts as a carrier for various nutrients in the body. Water plays a crucial role in the transport and absorption of nutrients, the transport and exchange of gases, and the transport and excretion of metabolic products. For example, it transports oxygen, vitamins, glucose, amino acids, enzymes, and hormones throughout the body; and transports metabolic waste products such as urea and uric acid to the kidneys for excretion in urine. Fourthly, water has a regulatory and inhibitory function. Water's high specific heat capacity helps regulate body temperature. The best way to prevent heatstroke is to drink plenty of water. This is because the three major energy-producing nutrients, with the participation of water, utilize oxygen for oxidation metabolism, releasing energy. The evaporation of water further dissipates a large amount of energy, preventing body temperature from rising. When the body is dehydrated, excess energy is difficult to dissipate in time, leading to heatstroke. In addition, water can improve the circulation of body fluids, regulate muscle tension, and maintain the body's osmotic pressure and acid-base balance. Fifth, it has a lubricating and moisturizing function. Exercising in a dehydrated state is risky. Because tissues and organs lack water lubrication, they are easily damaged. Therefore, it is best to drink plenty of water an hour before exercising. Water acts as a lubricant for the movement of joints, ligaments, muscles, and membranes in the body. Water's low viscosity lubricates friction points in the body, reducing friction between internal organs, preventing sports injuries, and allowing organs to move flexibly. At the same time, water also has a moisturizing function, keeping body cells constantly moist and maintaining plump and soft skin. Regular and measured hydration will make the skin particularly hydrated, plump, and elastic. It can be said that water is also an excellent product for beauty and skin care. Sixth, it has dilution and detoxification functions. People who don't like to drink water are often prone to acne because the body's detoxification requires water. Without enough water, toxins are difficult to effectively eliminate, accumulating in the body and easily causing acne. In fact, water not only has excellent dissolving power but also plays a vital role in diluting the body. While the kidneys excrete water, they also flush out metabolic waste, toxins, and excess medications, reducing the absorption of toxins in the intestines and preventing the chronic accumulation of harmful substances that could lead to poisoning. Therefore, it is important to drink enough water when taking medication to effectively eliminate any side effects.